Found this guidance 61000-3-3__-3-11_voltage_fluctuations__flicker.pdf (emcstandards.co.uk) which agrees it concerns light flickering and inrush currents. It also states, in the overview on page 4, it is illegal to connect an item if the power supply does not conform to the requirements
for 61000-3-12 the manufacturer's instructions state "it is the responsibility of the installer or user..." so you could pass the buck on this one;)
No, I don't think so ... when we are talking about loads in excess of 40 A (per phase).
I think the wrong emphasis in the instructions, though, for loads <= 9 kW (otherwise this would appear on the instructions for a lot of domestic showers).
